Changeset 246 for trunk/kernel/mm/mapper.h

Timestamp:

Jul 20, 2017, 12:55:23 PM (7 years ago)

Author:

alain

Message:

Fix a major bug in FATFS : miss handling in the FAT mapper.

File:

• trunk/kernel/mm/mapper.h (modified) (2 diffs)

trunk/kernel/mm/mapper.h

@@ -49 +49 @@
  * - The mapper is protected by a blocking "rwlock", to support several simultaneous
  *   readers, and only one writer. This lock implement a busy waiting policy.
- * - The vfs_mapper_move_page() and vfs_mapper_load_all() functions are used to move
- *   pages to or from the file system on device.
+ * - The mapper_get_page() function that return a page descriptor pointer from a page
+ *   index in file is in charge of handling the miss on the mapper cache.
+ * - The vfs_mapper_move_page() function is used to handle miss on one specific page,
+ *   or update a dirty page on device.
+ * - The vfs_mapper_load_all() functions is used to load all pages of a given directory
+ *   into the mapper.
  * - the mapper_move() function is used to move data to or from an user buffer.
  *   This user space buffer can be physically distributed in several clusters.
- * - The mapper_get_page() function that return a page descriptor pointer from a page
- *   index in file is in charge of handling the miss on the mapper cache.
- * - In the present implementation the cache size increases on demand, and the
- *   allocated memory is only released when the mapper/inode is destroyed.
+ * - In the present implementation the cache size for a given file increases on demand,
+ *   and the  allocated memory is only released when the mapper/inode is destroyed.
  ******************************************************************************************/
 
@@ -67 +69 @@
 {
         struct vfs_inode_s * inode;           /*! owner inode                                     */
+    uint32_t             type;        /*! file system type                                */
         grdxt_t              radix;           /*! pages cache implemented as a radix tree         */
         rwlock_t             lock;        /*! several readers / only one writer               */